#video_main {
    width: 375px;
    height: 667px;
    border: 1px solid black;
    position: absolute;
    left: 0;
    top: 0;
    z-index: 1;
    background-color: gray;
}

#video_local, #video_remote {
    width: 100px;
    height: 100px;
    border: 1px solid #1ABC9C;
    position: absolute;
    left: 22px;
    top: 443px;
    z-index: 2;
}

#video_remote {
    left: 142px;
    border: 1px solid black;
}

#btn_microphone, #btn_phone, #btn_device {
    width: 50px;
    height: 50px;
    position: absolute;
    top: 572px;
    z-index: 2;
}

#btn_microphone {
    left: 22px;
}

#btn_phone {
    left: 165px;
}

#btn_device {
    left: 307px;
}

.img_box{
    width: 50px;
    height: 50px;
    /* border: 1px solid red; */
    font-size: 50px;
    text-align: center;
    line-height: 50px;
    color: white;
}

.selected {
    color: #1ABC9C;
}

#vsrc {
    position: fixed;
    z-index: 99999;
}
